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trough

Pronunciation: (trôf, trof or, sometimes, trôth, troth),[key]—n.1. a long, narrow, open receptacle, usually boxlike in shape, used chiefly to hold water or food for animals.
2. any of several similarly shaped receptacles used for various commercial or household purposes.
3. a channel or conduit for conveying water, as a gutter under the eaves of a building for carrying away rain water.
4. any long depression or hollow, as between two ridges or waves.
5. Oceanog.a long, wide, and deep depression in the ocean floor having gently sloping sides, wider and shallower than a trench. Cf. trench (def. 4).
6. Meteorol.an elongated area of relatively low pressure.
7. the lowest point, esp. in an economic cycle.